From: Michael Schroeder <mls@suse.de>
Date: Mon, 14 Sep 2015 10:20:10 +0000 (+0200)
Subject: make mkmask robust against zero elements
X-Git-Tag: 0.6.13~12
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a2a5f3771c01811d22da48619cbb07d31abdf294;p=thirdparty%2Flibsolv.git

make mkmask robust against zero elements
---

diff --git a/src/hash.h b/src/hash.h
index 1290afa1..4f595bbb 100644
--- a/src/hash.h
+++ b/src/hash.h
@@ -73,14 +73,14 @@ relhash(Id name, Id evr, int flags)
 
 
 /* compute bitmask for value
- * returns smallest (2^n-1) > 2 * num
+ * returns smallest (2^n-1) > 2 * num + 3
  *
  * used for Hashtable 'modulo' operation
  */
 static inline Hashval
 mkmask(unsigned int num)
 {
-  num *= 2;
+  num = num * 2 + 3;
   while (num & (num - 1))
     num &= num - 1;
   return num * 2 - 1;